MacConkey agar plates represent ________ medium.
A. a minimal
B. a selective
C. a differential
D. both a differential and a selective
E. both a minimal and a selective
Answer: D
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The technique that allows various proteins to be differentiated based on size, once the proteins have been denatured, is
A) SDS-PAGE. B) photobleaching. C) liposome formation. D) ferritin-conjugated lectins. E) the freeze-fracture technique.
Volvox, a species of ________ algae, lives in spherical colonies joined by thin cytoplasmic strands
a. charophyte b. red c. brown d. chlorophyte
When blood leaves the lungs, where does it go next?
a. the left side of the heart b. out to the body c. the right side of the heart d. up to the brain
Although they are smaller than K+, Na+ ions fail to pass through K+ channels because Na+
A) is repulsed by positively charged amino acids at the mouth of the channel. B) is too small to interact with oxygen atoms in amino acids on all sides of the channel and therefore does not completely lose its waters of hydration. C) is always transported complexes to Cl?. D) is always transported in a complex with two other Na+ ions. E) is attracted by other Na+ ions, which are at higher concentration outside than inside the cell.